Eric Lee / smarc-uboot

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drivers/timer/altera_timer.c 2.35 KB
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  /*
   * (C) Copyright 2000-2002
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   * Scott McNutt <smcnutt@psyent.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <dm.h>
  #include <errno.h>
  #include <timer.h>
  #include <asm/io.h>
  
  DECLARE_GLOBAL_DATA_PTR;
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  /* control register */
  #define ALTERA_TIMER_CONT	BIT(1)	/* Continuous mode */
  #define ALTERA_TIMER_START	BIT(2)	/* Start timer */
  #define ALTERA_TIMER_STOP	BIT(3)	/* Stop timer */
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  struct altera_timer_regs {
  	u32	status;		/* Timer status reg */
  	u32	control;	/* Timer control reg */
  	u32	periodl;	/* Timeout period low */
  	u32	periodh;	/* Timeout period high */
  	u32	snapl;		/* Snapshot low */
  	u32	snaph;		/* Snapshot high */
  };
  
  struct altera_timer_platdata {
  	struct altera_timer_regs *regs;
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  };
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  static int altera_timer_get_count(struct udevice *dev, u64 *count)
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  {
  	struct altera_timer_platdata *plat = dev->platdata;
  	struct altera_timer_regs *const regs = plat->regs;
  	u32 val;
  
  	/* Trigger update */
  	writel(0x0, &regs->snapl);
  
  	/* Read timer value */
  	val = readl(&regs->snapl) & 0xffff;
  	val |= (readl(&regs->snaph) & 0xffff) << 16;
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  	*count = timer_conv_64(~val);
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  	return 0;
  }
  
  static int altera_timer_probe(struct udevice *dev)
  {
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  	struct altera_timer_platdata *plat = dev->platdata;
  	struct altera_timer_regs *const regs = plat->regs;
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  	writel(0, &regs->status);
  	writel(0, &regs->control);
  	writel(ALTERA_TIMER_STOP, &regs->control);
  
  	writel(0xffff, &regs->periodl);
  	writel(0xffff, &regs->periodh);
  	writel(ALTERA_TIMER_CONT | ALTERA_TIMER_START, &regs->control);
  
  	return 0;
  }
  
  static int altera_timer_ofdata_to_platdata(struct udevice *dev)
  {
  	struct altera_timer_platdata *plat = dev_get_platdata(dev);
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  	plat->regs = map_physmem(devfdt_get_addr(dev),
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  				 sizeof(struct altera_timer_regs),
  				 MAP_NOCACHE);
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  	return 0;
  }
  
  static const struct timer_ops altera_timer_ops = {
  	.get_count = altera_timer_get_count,
  };
  
  static const struct udevice_id altera_timer_ids[] = {
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  	{ .compatible = "altr,timer-1.0" },
  	{}
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  };
  
  U_BOOT_DRIVER(altera_timer) = {
  	.name	= "altera_timer",
  	.id	= UCLASS_TIMER,
  	.of_match = altera_timer_ids,
  	.ofdata_to_platdata = altera_timer_ofdata_to_platdata,
  	.platdata_auto_alloc_size = sizeof(struct altera_timer_platdata),
  	.probe = altera_timer_probe,
  	.ops	= &altera_timer_ops,
  	.flags = DM_FLAG_PRE_RELOC,
  };